How Do Babies Breathe in the Womb?

If babies' lungs are nonfunctional in the womb, how do they breathe?! Here I go over the major vessels involved with fetal circulation as well as what these vessels turn in to after the baby is born. Key Takeaways: - Veins take blood TO the heart. - Arteries carry blood AWAY from the heart. - There is one umbilical artery and two umbilical veins. - Apart from the foramen ovale, all of the other postnatal structures turn into some type of ligament and have that term in the name.